package page244;

public class Test1 {
    public static void main(String[] args){
        String a = "abcABC";
        String b = "XYZxyz";
        System.out.println(a.toLowerCase());
        System.out.println(a.toUpperCase());
        System.out.println(b.toLowerCase());
        System.out.println(b.toUpperCase());
        System.out.println(a.concat(b));
        System.out.println(b.concat(a));

    }
}
